In a TED talk, Harald Haas of the University of Edinburgh shows how a beam from a light bulb can be rigged up to transmit a high definition video stream. The grand vision: LED lights with added microchips will let us transmit thousands of data streams in parallel, enabling us to access the Internet on smartphones wherever there is a light source.

(See all of MIT Sloan Management Review's coverage of TED.)
The last session of the day, the awarding of the TED Prize, has ended. I'll post an overview of the long day's sessions tomorrow morning. For now, a few people have written me today, so I'll answer their questions and try to give a sense of what it's like being at the event.

This week, MIT Sloan Management Review is in Long Beach, Calif., for this year's TED conference, which starts tomorrow. We'll report daily. Now in its 25th year, TED remains an unclassifiable event. The letters of the name originally stood for technology, entertainment, and design, but in recent years the tag line for the event has become "ideas worth spreading."